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CCE
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CCE-95071-7

Platform: cpe:/o:debian:debian_linux:11.x, cpe:/o:ubuntu:ubuntu_linux:20.04, cpe:/o:ubuntu:ubuntu_linux:22.04, cpe:/o:ubuntu:ubuntu_linux:23.04Date: (C)2020-10-15   (M)2023-09-01



Secure ICMP redirects are the same as ICMP redirects, except they come from gateways listed on the default gateway list. It is assumed that these gateways are known to your system, and that they are likely to be secure. Rationale: It is still possible for even known gateways to be compromised. Setting net.ipv4.conf.all.secure_redirects to 0 protects the system from routing table updates by possibly compromised known gateways. Fix: Set the net.ipv4.conf.all.secure_redirects and net.ipv4.conf.default.secure_redirects parameters to 0 in /etc/sysctl.conf and run sysctl -p command: net.ipv4.conf.all.secure_redirects=0 net.ipv4.conf.default.secure_redirects=0 Modify active kernel parameters to match: # /sbin/sysctl -w net.ipv4.conf.all.secure_redirects=0 # /sbin/sysctl -w net.ipv4.conf.default.secure_redirects=0 # /sbin/sysctl -w net.ipv4.route.flush=1


Parameter:

[yes/no]


Technical Mechanism:

Set the net.ipv4.conf.all.secure_redirects and net.ipv4.conf.default.secure_redirects parameters to 0 in /etc/sysctl.conf: net.ipv4.conf.all.secure_redirects=0 net.ipv4.conf.default.secure_redirects=0 Modify active kernel parameters to match: # /sbin/sysctl -w net.ipv4.conf.all.secure_redirects=0 # /sbin/sysctl -w net.ipv4.conf.default.secure_redirects=0 # /sbin/sysctl -w net.ipv4.route.flush=1

CCSS Severity:CCSS Metrics:
CCSS Score : 9.3Attack Vector: NETWORK
Exploit Score: 3.9Attack Complexity: LOW
Impact Score: 4.7Privileges Required: NONE
Severity: CRITICALUser Interaction: NONE
Vector: AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:HScope: CHANGED
 Confidentiality: LOW
 Integrity: NONE
 Availability: HIGH
  

References:
Resource IdReference
SCAP Repo OVAL Definitionoval:org.secpod.oval:def:87296
SCAP Repo OVAL Definitionoval:org.secpod.oval:def:85147
SCAP Repo OVAL Definitionoval:org.secpod.oval:def:92262
SCAP Repo OVAL Definitionoval:org.secpod.oval:def:65944


OVAL    4
oval:org.secpod.oval:def:65944
oval:org.secpod.oval:def:87296
oval:org.secpod.oval:def:92262
oval:org.secpod.oval:def:85147
...
XCCDF    7
xccdf_org.secpod_benchmark_NIST_800_53_r5_Debain_11
xccdf_org.secpod_benchmark_general_Ubuntu_23.04
xccdf_org.secpod_benchmark_NIST_800_53_r5_Debian_11
xccdf_org.secpod_benchmark_general_Ubuntu_22.04
...

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